Effect Of Arbuscular Mycorrhiza Fungi(AMF) On The Growth Of Tea Tree Under Salt Stress

By adopting mesocosm experiment, Camellia sinensis (L.) O. Kuntze var. Wuniuzao teaplant was used as test material and the VA (G.versiforme) mycorrhizal was inoculated to theone-year-old cutting seedlings of Wuniuzao. The first part of the test included four treatments,studied the effects of inoculating arbuscular mycorrhizal fungi (AMF) on the growth of teaplant, the AMF colonization rate and AMF dependence, the growth quality of tea plant, theabsorption of mineral nutrition, the water content in leaf tissue and the quality of tea undersalt stress. The second part of the test sets six salinity levels, the50d and100d after tea plantinoculated by AMF were studied to test the effects of AMF on the colonization rate of theroots, growth, the growth quality of tea plant, salt tolerance and the activity of soil acidphosphatase of tea plant under salt stress, to provide theoretical for tea planting under saltstress. The results are as follows:1. AMF could promote the plant growth under salt stress significantly, AMF-inoculationcould effectively improve growth of tea plant.2. Under salt stress, the growth of tea plant was inhibited, and N, P, K, Mg, Fe and Zncontents in the tea plants were increased by7.7%,31.2%,20.2%,23.8%,9.4%and9.5%,respectively, comared with the control treatment, and made K~+/Na~+ratio of the plant increasedobviously. It was suggested that AMF could promote the plant growth and nutrient uptake oftea plant.3. Under different salt concentrations, the free proline in the leaves significantlyincreased compared with ordinary cultivation, and the content increased with the higher AMFtreatment than those with the lower AMF treatment, and the membrane permeability andmalondialdehyde (MDA) contents significantly decreased, showed that the leaf membranelipid peroxidation under salt stress increased gradually accelerated and the injury wasgradually aggravated. All of the results were showed that the damage of salt stress on theplant would be alleviated and the adaptability of tea plant to salt environments would beimproved．4. The growth of tea plant can be inhibited by salt stress, and AMF could enhance the plants osmotic adjustment mechanism of salt tolerance, raise the activities of acid phosphataes,decrease the membrane lipid peroxidation. So the damage of salt stress on the plant would bealleviated and the adaptability of tea plant to salt environments would be improved．5. In a certain extent, promoting effect of AMF on the growth of tea will be affected bysalt stress, and the promoting was decreased with the degree of salt stress increased. The roleof mycorrhizal would be inhibited by high salt stress. Only in the first100d, under5mmol/kgand10mmol/kg salt concentration, there was no significant difference in the infection rate ofthe tea tree.